Driving gear for drums



May 17, 1932. 4 A. TACKE 1,858,62

DRIVING GEAR FOR DRUMS Filed Jan. 3, 1930 Fig 7 If 2i 3/ 3/ i k s Patented May 17, 1932 ALBERT TAGKE. OF'R-HEINETIN WESTFALIA, GERMANY ara? HGT,

' DRIVING GEAR Fort nRUMs Application filed January 3, 1930, Serial No. 418,394, and in Germany'January 3, 1929.

My invention relates to improvements in electric individual drives of rollers and the like. 1 a y I F or the electric individuahsectional or 1 5 separate drive of rollers, calenders, drums,

cylinders and the like a reduction gear is frequently required since the operating speed of the roller is generally considerably lower thanthat of the driving motor. The ar- If) rangement of this gear presented up to now considerable difficulties particularly if it is necessary to introduce heating steam, a cooling medium, a boiling liquid or the like into the interior of the drum through an axial 'bore in its journal or trunnion for the purpose of heating or cooling the shell of the drum, for instance in drier cylinders'of paper making machines. The space requirement of the driving motor and the gear was up to now also very considerable so that it was almost impossible to connect an electric drive to an existing machine to be driven.

My invention consists of a reduction gear for an electric individual drive of rollers and the like which eliminates the defects of the hitherto known drives. In my improved drive, 'thedriving wheel of which ismounted on a protruding shaft end of the roller, the gear case rests upon the hubof the gear 'wheel and is supported further on the supporting frame of the'roller. The gear case maypreferably be connected to the motor frame in place of the usual end-shield at the drive end in the'manner of the well known geared motors' so" that the space requirement of the motor and the gearing becomes very small.

To facilitate the connection of the gear to the drum, the motor with the gear may be moved into the desired position around the stud mounted on the bearing frame of the roller which engages an eye on the motor frame or which 1s secured in an eye of the gear case and engages a cast or screwed on eye on the bearing frame of the roller. The gear case may consist of two parts the joint tio-nal side elevation, and

of which coincides with a plane laid through the axes ofthe gear wheels, for insta nce,'-or forms any desired angle with this plane.

In the drawings aiiixed to my specification: Fig. 1 represents a longitudinal section through one embodiment of my invention,'on the line 77 in Fig. 2. i

Fig. 2, a front elevation of Fig. 1, Fig. 3, a modification of adetail in see- Fig. 1, a similar view of a further modification.

Like numerals of reference .indicate like parts in all the figures of the drawings.

Referring to Fig. 1 it will be seen that the electric motor 11 drives the drum 16 through adouble step spur wheel train 12, 18, 14,15. The spur wheel or gear 15 of the second gear step is mounted on the shaft end 17 ofthe drum 16 and is keyed to it by a key 18. The

shaft stud 17 is extended further out and is provided with a continuous axial bore 19 through which steam may be conducted into the drum 16 assuming that this drum is being employed as drier cylinder of a paper making machine. The gear is enclosed by a case consisting of the two parts 20 and 21. which by means of an interposed flanged cover 22 is flanged on to the frame of the motor 11 so that the axial length of the gear connected to the motor 11 is'very short. The joint 23 of the two constituent parts of the gear case is in the embodiment illustrated in Fig.v 2 of the drawings located in a plane" placed through the centers of the axes of the gear wheels and the motorybut it will be understood that it may be located at any desired angle to this plane. By removing one. of the halves of the gear-case the entire gear may thus be rendered accessible for inspection or repairwithout the necessityof dismount-ing any other parts ofthe gear. The gear case with the electric motor 11 is located close to the framework30 supporting the bearing 29 of the drum 16. 1 The gear case is supported on the bearing frame by means of a stud 25 mounted on the bearing frame of the drum and engaging an eye 24 on the gear case.

I *The cover 22 serves at the same time as an endplate for the motor 11,- and is for this case by means of screws 32.

purpose provided with a bearing 26 for the motor shaft carrying the pinion 12 while the intermediate or jack shaft 27 carrying the gear 13 and pinion 14 is journaled in the gear case and is extended through the wall of the case to enable an auxiliary speed to be derived from this shaft, if desired. The gear case is sealed by the covers 31 held on the These covers are not split so that they serve for carrying one half 0f the gear case when the other half of the case is removed and a support of the case is thus rendered unnecessary. The fitting and dismantling as well as the inspection of the gear is thus greatly facilitated.

Since either heating steam or a cooling medium is supplied to the drum through the longitudinal bore 19 in the shaft stud 17 care must be taken that the gear wheels are as far as possible protected against temperature fluctuations occurring during operations. In the embodiment illustrated in Fig. 1 of the drawingsthe hub of the spur wheel or gear 15 is for this purpose internally provided with an annular recessed portion 33 so that it is in contact with the shaft stud 17 of the drum with a comparatively small area only.

Instead of providing this recessed portion in the hub of the spur wheel the hub may be mounted upon the stud 17 through'the intermediary of an interposed sleeve which consists of a suitable bad conductor of heat and is thus not liable to transmit temperature fluctuations.

To obtain a particularly efficient protection of the gear against temperature fluctuations the hub of the spur wheel 15 may, as shown in Fig. 3 of the drawings, be provided with a large internal recess 34 serving for the reception of a material suitable to insulate against heat. The size of this recess 34 and the nature of the insulating substance may be adapted to be temperature fluctuations developing so that the spur wheel 15 is effi- 'ciently protected against temperature fluctuations and the stresses liable to be set up thereby. In some cases it .may be advisable to insulate the hub of the spur wheel 15 still further from the drum stud by means of a sleeve. Otherwise the design of the spur wheel remains the same as illustrated in Figs. 1 and 2 of the drawings.

If particularly high temperature fluctuations develop, for instance, if the drum is used for boiling processes in the chemical industry or the like, it is advisable to cool the hub of the spur wheel 15 by'special means. Suitable means for effecting this are by way of example illustrated in Fig. 4 of the drawings. The hub of the wheel 15 is here extended outwardly through the gear case in both directions and provided with a circular group of axially directed bores or ducts 41 in communication with a central annular recess 42 in the hub of the wheel 15 so that cooling air is able to enter into the cavity 42. The

covers 43 of the gear case are then placed over the extended hub of the spur wheel 15. The gear designed according to my invention has the advantage that a one-sided additional load on the shaft studof the-drum by the tooth pressure of the gear or wheel 15 is quite eliminated. The driving motor may furthermore easily be exchanged and the entire self-containedgear drive be readily connected and disconnected to and from the driven machine and the motor. Since my improved gear permits the shaft of the roller to readily protrude beyond the gear case, it is particularly suitable for cases in which the interior of the drum is accessible from outside by an axial bore in the shaft.

It will be understood that structural alterations may be made without departing from heating medium to the, roller, and a gear wheel fixed to said shaft endand journalled in said casing, and having a hollow hub and means contained in the hollowyhub portion for preventing the transfer of heat from said shaft end to said gear wheel.

2. In an individual electricdrive for internally heated rollers in combination an electric motor, a reduction gear connected to said motor, a casing surrounding said reduction gear and carrying said motor, said roller having a hollow shaft end forsupplying a heating medium to the roller, and a 211' wheel fixed to said shaft end and journalled in said casing, the hub of said gear wheel protrudingat both endsbeyond said casing and containing aplurality of axially directed ducts adapted to conducta cooling medium through said hub for preventing transfer of heat from said shaft end to said gear wheel. In testimony whereof I affix my signature.

. ALBERT .TACKE. 

